Injection molding machine barrel

Abstract

The invention relates to the field of injection molding machines, and discloses a barrel of an injection molding machine, comprising a barrel, a nozzle and a screw, wherein an opening and closing component for opening and closing the nozzle is arranged in the barrel, and a linkage component for controlling the opening and closing of the opening and closing component is arranged between the opening and closing component and the screw; the opening and closing component comprises a slot arranged on the inner wall of the nozzle and a sealing block whose opposite ends are separated and seal the slot opening when two blocks are engaged or whose opposite ends are sealed and plugged into the slot when two blocks are opened, and a guide component for guiding the separation of the two blocks and a first spring for driving the two blocks to engage with each other are arranged between the two sealing blocks; the linkage component comprises an air cavity arranged in the nozzle and connected to the slot, a piston block sealingly sliding in the air cavity and a second spring arranged in the air cavity, and a matching component for driving the piston block to move is arranged between the piston block and the screw; as the piston block retracts, the sealing blocks move away from each other and the nozzle opens; as the piston block extends and resets, the sealing blocks approach each other and the nozzle closes.

Description

Technical Field

[0001] The invention relates to the field of injection molding machines, in particular to a barrel of an injection molding machine. Background Art

[0002] Injection molding machine is also called injection molding machine or injection machine. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics.

[0003] A Chinese patent with announcement number CN113650236A discloses an anti-clogging injection molding machine nozzle, including an extrusion barrel, a nozzle, and an anti-clogging component. An annular connecting plate is fixed to one end of the extrusion barrel near the nozzle. The nozzle is detachably connected to the connecting plate on the extrusion barrel through a connecting component. An arc groove is opened on the connecting plate, and the arc groove is symmetrically arranged about the axis of the extrusion barrel. The anti-clogging component is rotatably connected to the inside of the nozzle and is driven to rotate by the pressure generated during extrusion inside the extrusion barrel.

[0004] The nozzle in the above structure can be installed on the connecting plate on the extruder barrel through the connecting component. When the material in the extruder barrel is extruded, the extrusion force generated inside the extruder barrel will drive the anti-clogging component to rotate, thereby stirring the material and reducing the probability of the material being blocked at the nozzle outlet. However, after the material is extruded from the nozzle outlet, there will still be residual material in the nozzle channel. The residual material will seep out from the nozzle outlet, stick to the nozzle outlet, or even drip and cause "flowing", which will not only lead to material waste, but also affect the injection molding quality of subsequent products. Summary of the invention

[0005] The present invention aims to address the shortcomings of the prior art that after the material is extruded from the discharge port of the nozzle, residual material will still remain in the nozzle channel. The residual material will seep out from the nozzle port, stick to the nozzle port, or even drip and cause a "flowing" phenomenon, which not only leads to material waste but also affects the injection molding quality of subsequent products. The invention provides an injection molding machine barrel with a nozzle plugging structure.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] An injection molding machine barrel comprises a barrel, a nozzle located at an injection end of the barrel, and a screw located in the barrel and moving toward or away from the nozzle. An opening and closing component for opening and closing the nozzle is arranged in the barrel, and a linkage component is arranged between the opening and closing component and the screw to drive the opening and closing component to open or close as the screw advances or retreats; the opening and closing component comprises a slot symmetrically arranged on the inner wall of the nozzle, and two sealing blocks that can be relatively engaged or relatively opened. When the sealing blocks are relatively engaged, the opposite ends of the two seals are separated and seal the opening of the slot. When the sealing blocks are relatively opened, the opposite ends of the two seals are sealed and plugged into the slot. At the opposite ends of the sealing blocks, A guide component is provided for guiding the direction of the two being in an embraced state, and a first spring is provided for keeping the two in an embraced state under normal conditions; a linkage component includes an air cavity provided on the inner wall of the nozzle and connected to the bottom of the slot, a piston block which is sealed and moves in the air cavity, and a second spring provided at the bottom of the air cavity to drive the piston block to be in an extended state, and a matching component is provided between the piston block and the screw rod for retracting the piston block as the screw rod is pushed forward and extending and restoring the piston block as the screw rod is retreated; as the piston block retracts, the sealing blocks move away from each other and the nozzle is opened; as the piston block is extended and reset, the sealing blocks move closer to each other and the nozzle is closed.

[0008] By adopting the above scheme, the two sealing blocks can be driven to embrace or open relative to each other through the linkage component. When the screw is pushed forward, the matching component arranged between the piston block and the screw will drive the piston block in the air cavity to retract. Since one end of the air cavity is connected to the slot, and one end of the sealing block is sealed at the opening of the slot, when the piston block retracts, the negative pressure generated in the air cavity will suck the sealing block at the opening of the slot into the slot, so that the two sealing blocks move away from each other and open, and the nozzle is opened; when the screw retreats, the matching component arranged between the piston block and the screw will drive the piston block in the air cavity to move and reset in the direction close to the slot. At this time, the air cavity will gradually restore normal pressure, and the two sealing blocks will approach each other under the drive of the first spring to seal the opening of the nozzle, thereby reducing the probability of the material inside the barrel flowing out of the nozzle after injection, and reducing the waste of material.

[0009] Preferably, the mating component includes a connecting rod protruding from the front end of the screw and extending along the axial direction of the screw, a driving block vertically elastically telescopically arranged on the outer ring wall of the connecting rod, and a mating groove arranged on the piston block. A through groove for the driving block to pass through and a clearance groove for partial insertion are respectively arranged on the inner ring wall of the nozzle on the side of the mating groove close to or away from the connecting rod. A first mating inclined surface extending toward the center of the barrel in the direction away from the nozzle is arranged on the side of the driving block close to the through groove. A second mating inclined surface, a third mating inclined surface and a fourth mating inclined surface that can be mated with the first mating inclined surface are respectively arranged on the inner walls of the through groove, the mating groove and the clearance groove close to one end of the screw. When the sealing block retracts to the maximum stroke, one end of the first mating inclined surface is inserted into the clearance groove and the other end is located inside the through groove.

[0010] By adopting the above scheme, when the screw is pushed forward, the drive block telescopically arranged on the connecting rod will gradually approach the through groove, and when the drive block moves to the through groove, the drive block will gradually be inserted into the through groove, and as the drive block is inserted into the through groove, the end of the drive block will gradually abut against the piston block, and gradually insert into the matching groove on the piston block as the screw is pushed forward. Since a first matching inclined surface and a fourth matching inclined surface that can match each other are respectively provided between the drive block and the matching groove, the drive block will gradually be inserted into the matching groove as the screw is pushed forward, and the piston block will gradually retreat due to the insertion of the drive block, so that the air cavity is in a state of negative pressure, so that the two sealing blocks are sealed and inserted into the slot to open the nozzle.

[0011] Preferably, an axial positioning structure is provided between the connecting rod and the sealing block, which enables the connecting rod and the sealing block to form a piston rod that can move sealingly on the inner wall of the nozzle when the screw is retracted.

[0012] Preferably, the axial positioning structure includes an annular groove provided at the connecting rod away from the screw rod and an arc groove provided on one side adjacent to the two sealing blocks and partially inserted into the annular groove when the two sealing blocks are embraced, and the width of the annular groove is greater than the thickness of the sealing block.

[0013] By adopting the above scheme, the arc grooves arranged on the opposite sides of the two sealing blocks enable the two sealing blocks to be inserted into the annular groove on the connecting rod when they embrace each other, so that the connecting rod can drive the two mutually embraced sealing blocks to slide in a sealed manner inside the nozzle. When the screw drives the connecting rod to advance forward, the sealing block can move forward with the connecting rod, so that the sealing block slides to the opening of the slot to seal the opening of the slot, and then the two sealing blocks are driven to open to each other through the matching components, thereby opening the nozzle; when the screw retracts, the matching components drive the two sealing blocks to embrace each other. Since the width of the annular groove is greater than the thickness of the sealing block, when the screw drives the connecting rod to retract, the two sealing blocks can still embrace each other and be inserted into the annular groove. Afterwards, as the screw retreats, the two sealing blocks inside the sealing sliding nozzle can scrape the material remaining inside the nozzle from the inner wall of the nozzle and push it back into the barrel, thereby further reducing material waste.

[0014] Preferably, the guide assembly includes at least one guide sleeve of decreasing size and mutually nested in the receiving groove, one end of the guide sleeve with the smallest size is fixed to a sealing block without a receiving groove, the first spring is arranged in the innermost guide sleeve, and a first anti-slip component for reducing the probability of the guide sleeve slipping out of the receiving groove or other guide sleeves is arranged between the guide sleeve and the inner wall of the receiving groove and between the guide sleeves.

[0015] By adopting the above scheme, when the two sealing blocks are opened to each other, the sealing block without the accommodating groove will pull the guide sleeve with the smallest size fixed to it, so that it moves in the direction away from the accommodating groove. Because the first anti-slip component is provided between the two guide sleeves or between the guide sleeves and the inner wall of the accommodating groove, when the smaller guide sleeve moves in the direction away from the accommodating groove, the smaller guide sleeve can drive the guide sleeve with a larger size than it to move in the direction away from the accommodating groove through the first anti-slip component, thereby guiding the mutual opening of the two sealing blocks. At the same time, the first spring is provided in the innermost guide sleeve, and the guide sleeve can also protect the first spring, thereby increasing the service life of the first spring.

[0016] Preferably, the first anti-slip component includes a first elastic hook arranged on the outer wall of the guide sleeve near the bottom, an avoidance groove is arranged on the outer wall of the guide sleeve for avoiding when the first elastic hook is deformed, and a first engaging groove is arranged on the inner wall of the accommodating groove and the inner wall of the guide sleeve, the end of which can be engaged with the first elastic hook and for the first elastic hook to move therein.

[0017] By adopting the above scheme, when the smaller guide sleeve moves in the direction away from the accommodating groove, the first elastic hook will move in the first engaging groove and gradually approach the end of the first engaging groove. When the first elastic hook is engaged with the first engaging groove, the two guide sleeves can be lowered or the guide sleeves and the accommodating groove can be separated from each other. At the same time, when the first elastic hook in the smaller guide sleeve is engaged with the end of the first engaging groove in the guide sleeve larger than the smaller guide sleeve, the smaller guide sleeve will pull the larger guide sleeve away from the accommodating groove, thereby guiding the mutual opening of the two sealing blocks. The avoidance groove can avoid the deformation of the first elastic hook when the smaller guide sleeve is installed in the larger guide sleeve, thereby allowing the smaller guide sleeve to be installed in the larger guide sleeve.

[0018] Preferably, an avoidance hole is provided at one end of the screw near the connecting rod for partial insertion of the connecting rod when the driving block is inserted into the avoidance groove so that the screw can continue to move forward to further extrude the material in the barrel. There is a certain damping in the sliding between the avoidance hole and the connecting rod, and a second anti-slip component is provided between the end of the connecting rod near the avoidance hole and the avoidance hole to reduce the probability of the connecting rod escaping from the avoidance hole.

[0019] By adopting the above scheme, an avoidance hole is set on the screw rod for one end of the connecting rod to be inserted, and the second anti-detachment component is set at one end of the connecting rod close to the avoidance hole and between the avoidance holes to reduce the probability of the connecting rod and the screw rod being detached. The set avoidance hole can limit the movement of the connecting rod by allowing the screw rod to continue to advance for a distance when the connecting rod moves to the driving block thereon and inserts into the avoidance groove, so that the screw rod can extrude the material in the nozzle more fully, reduce the material remaining in the nozzle after extrusion, and further reduce the waste of material.

[0020] Preferably, the second anti-slip component includes a second elastic hook arranged at one end of the connecting rod close to the screw rod, an avoidance ring groove arranged at one end of the connecting rod close to the second elastic hook for the second elastic hook to avoid when it is deformed, and a second engaging groove whose end portion is arranged in the avoidance hole and can be engaged with the second elastic hook and for the second elastic hook to slide therein.

[0021] By adopting the above scheme, the second elastic hook arranged on the connecting rod can be engaged with the end of the second engaging groove in the avoidance groove on the screw rod, thereby reducing the probability of the connecting rod detaching from the end of the screw rod. The avoidance ring groove arranged on the connecting rod can avoid the deformation of the second elastic hook when the end of the connecting rod equipped with the second elastic hook is inserted into the avoidance hole, so that one end of the connecting rod can be inserted into the avoidance hole on the screw rod.

[0022] The present invention has significant technical effects due to the adoption of the above technical scheme: the two sealing blocks can be driven to relatively embrace or relatively open by the arranged linkage component, and when the screw is pushed forward, the matching component arranged between the piston block and the screw will drive the piston block in the air cavity to retract, and since one end of the air cavity is connected with the slot, and one end of the sealing block is sealed at the opening of the slot, when the piston block retracts, the negative pressure generated in the air cavity will suck the sealing block at the opening of the slot into the slot, so that the two sealing blocks move away from each other and open, and the nozzle is opened; when the screw retreats, the matching component arranged between the piston block and the screw will drive the piston block in the air cavity to move and reset in the direction close to the slot, and at this time, the air cavity will gradually restore normal pressure, and the two sealing blocks will approach each other under the drive of the first spring to seal the opening of the nozzle, thereby reducing the probability of the material inside the barrel flowing out of the nozzle after injection, and reducing the waste of material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric view of an injection molding machine barrel in the present invention;

[0024] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0025] Figure 3 It is a left side view of a barrel of an injection molding machine in the present invention;

[0026] Figure 4 yes Figure 3 Sectional view at the middle BB;

[0027] Figure 5 yes Figure 4 Enlarged view of point C in the middle;

[0028] Figure 6 yes Figure 4 The enlarged view of point D in the middle;

[0029] Figure 7 It is a left side view of a barrel of an injection molding machine in the present invention;

[0030] Figure 8 yes Figure 7 Sectional view at EE;

[0031] Fig. 9 yes Figure 8 The enlarged view of F in the middle;

[0032] Fig.10 yes Figure 8 Enlarged view of G in the middle;

[0033] Fig.11 yes Figure 8 The enlarged view of the H in the middle;

[0034] Fig.12 It is an axonometric view of the two sealing blocks when they are separated in the present invention;

[0035] Fig.13 It is a cross-sectional view of the two sealing blocks of the present invention when they are separated;

[0036] Fig.14 yes Fig.13 Enlarged view of point I in the middle.

[0037] The parts indicated by the numbers in the above figures are as follows: 1. barrel; 2. nozzle; 3. screw; 4. heating tube; 5. feed port; 6. slot; 7. sealing block; 801. first spring; 802. second spring; 803. third spring; 9. air cavity; 10. piston block; 11. connecting rod; 12. matching groove; 13. through groove; 14. giving way groove; 15. driving block; 16. receiving groove; 1 701, first mating bevel; 1702, second mating bevel; 1703, third mating bevel; 1704, fourth mating bevel; 18, annular groove; 19, arc groove; 20, guide sleeve; 2101, first elastic hook; 2102, second elastic hook; 22, avoidance groove; 2301, first clamping groove; 2302, second clamping groove; 24, avoidance hole; 25, avoidance annular groove; 26, accommodation groove. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Example

[0039] An injection molding machine barrel, reference Figure 1-Figure 5 , comprising a barrel 1, a nozzle 2 located at the injection end of the barrel 1, and a screw 3 located in the barrel 1 and moving closer to or away from the nozzle 2. A heating tube 4 for heating the material entering the barrel 1 and a feeding port 5 for feeding are also provided on the barrel 1. An opening and closing component for opening and closing the nozzle 2 is provided in the barrel 1, and a linkage component is provided between the opening and closing component and the screw 3 to drive the opening and closing component to open or close as the screw 3 moves forward or backward; the opening and closing component comprises a slot 6 symmetrically arranged on the inner wall of the nozzle 2, and two sealing blocks 7 that can be relatively engaged or relatively opened. When the sealing blocks 7 are relatively engaged, the opposite ends of the two are separated and the opening of the slot 6 is sealed. In the embodiment, the slot 6 is located at one end of the inner wall of the nozzle 2 close to the discharge port, and when the sealing blocks 7 are relatively opened, the opposite ends of the two are separated and the opening of the slot 6 is sealed. In the embodiment, the slot 6 is located at one end of the inner wall of the nozzle 2 close to the discharge port, and when the sealing blocks 7 are relatively opened, the opposite ends of the two are opened. The end is sealed and plugged with the slot 6, and a guide component for guiding the direction of the two to embrace is provided at the opposite end of the sealing block 7, and a first spring 801 that keeps the two in an embraced state under normal conditions; a linkage component includes an air cavity 9 arranged on the inner wall of the nozzle 2 and connected to the bottom of the slot 6, a piston block 10 that moves in the air cavity 9 in a sealed manner, and a second spring 802 that is arranged at the bottom of the air cavity 9 to drive the piston block 10 to be in an extended state, and a matching component is provided between the piston block 10 and the screw rod 3, which makes the piston block 10 retract as the screw rod 3 advances and extends and resets the piston block 10 as the screw rod 3 retreats; as the piston block 10 retracts, the sealing blocks 7 move away from each other, and the nozzle 2 opens; as the piston block 10 extends and resets, the sealing blocks 7 move closer to each other, and the nozzle 2 is closed.

[0040] refer to Figure 3-Figure 5 , Figure 7-Figure 10The matching parts include a connecting rod 11 protruding from the front end of the screw rod 3 and extending along the axial direction of the screw rod 3, a driving block 15 vertically elastically telescopically arranged on the outer ring wall of the connecting rod 11, and a matching groove 12 arranged on the piston block 10, a receiving groove 16 for receiving the retracted driving block 15 and a third spring 803 for driving the driving block 15 to partially extend out of the receiving groove 16 are arranged on the connecting rod 11, and a through groove 13 for the driving block 15 to pass through and a third spring 803 for partially inserting the driving block 15 are respectively arranged on the inner ring wall of the barrel 1 on the side of the matching groove 12 close to or away from the connecting rod 11. A first mating inclined surface 1701 extending toward the center of the barrel 1 in a direction away from the nozzle 2 is provided on one side of the driving block 15 near the through groove 13, and a second mating inclined surface 1702, a third mating inclined surface 1703 and a fourth mating inclined surface 1704 which can be mated with the first mating inclined surface 1701 are respectively provided on the inner walls of the through groove 13, the mating groove 12 and the mating groove 14 near one end of the screw 3. When the sealing block 7 retracts to the maximum stroke, one end of the first mating inclined surface 1701 is inserted into the mating groove 14 and the other end is located inside the through groove 13.

[0041] refer to Figure 1-Figure 2 , Figure 5 , Fig.10 An axial positioning structure is provided between the connecting rod 11 and the sealing block 7 so that when the screw 3 retracts, the connecting rod 11 and the sealing block 7 form a piston rod that can move sealingly on the inner wall of the nozzle 2. The axial positioning structure includes an annular groove 18 provided at the connecting rod 11 away from the screw 3 and an arc groove 19 provided on one side adjacent to the two sealing blocks 7 and partially inserted into the annular groove 18 when the two sealing blocks 7 are embraced. The width of the annular groove 18 is greater than the thickness of the sealing block 7.

[0042] refer to Figure 12-14 The guide assembly includes at least one guide sleeve 20 of decreasing size and mutually sleeved in the receiving groove 26, one end of the guide sleeve 20 with the smallest size is fixed to the sealing block 7 without the receiving groove 26, and the first spring 801 is arranged in the innermost guide sleeve 20. A first anti-slip component for reducing the probability of the guide sleeve 20 slipping out of the receiving groove 26 or other guide sleeves 20 is arranged between the guide sleeve 20 and the inner wall of the receiving groove 26 and between the guide sleeve 20 and the guide sleeve 20. The first anti-slip component includes a first elastic hook 2101 arranged near the bottom of the outer wall of the guide sleeve 20, and an avoidance groove 22 for avoiding when the first elastic hook 2101 is deformed is arranged on the outer wall of the guide sleeve 20, and a first clamping groove 2301 whose end can be mutually clamped with the first elastic hook 2101 and for the first elastic hook 2101 to move therein is arranged on the inner wall of the receiving groove 26 and the inner wall of the guide sleeve 20.

[0043] refer to Figure 6 , Fig.11A avoidance hole 24 is provided at one end of the screw 3 close to the connecting rod 11, into which the connecting rod 11 is partially inserted when the driving block 15 is inserted into the give way groove 14, so that the screw 3 can continue to move forward to further extrude the material in the nozzle 2. There is a certain damping in the sliding between the avoidance hole 24 and the connecting rod 11, and a second anti-slip component for reducing the probability of the connecting rod 11 slipping out of the avoidance hole 24 is provided between the end of the connecting rod 11 close to the avoidance hole 24 and the avoidance hole 24. The second anti-slip component includes a second elastic hook 2102 provided at one end of the connecting rod 11 close to the screw 3, an avoidance ring groove 25 provided at one end of the connecting rod 11 close to the second elastic hook 2102 for avoidance when the second elastic hook 2102 is deformed, and a second clamping groove 2302 whose end portion provided in the avoidance hole 24 can be mutually clamped with the second elastic hook 2102 and in which the second elastic hook 2102 can slide.

[0044] Specific opening and closing process of the sealing block: when the screw 3 is pushed forward, the screw 3 will drive the connecting rod 11 to move toward the nozzle 2. At this time, the driving block 15 on the connecting rod 11 will gradually approach the through groove 13. At the same time, the two sealing blocks 7 located in the annular groove 18 on the connecting rod 11 and moving away from the screw 3 will gradually approach the slot 6. When the driving block 15 is partially inserted into the through groove 13, the two sealing blocks 7 move to the opening of the slot 6 and seal the opening of the slot 6 and the ends thereof abut against the discharge port of the nozzle 2. After that, the screw 3 continues to The connecting rod 11 is continuously driven forward, so that the driving block 15 is gradually inserted into the through groove 13 and the matching groove 12 on the piston block 10. At the same time, as the screw 3 continues to be pushed forward, the sealing block 7 is in contact with the discharge port. Therefore, the sealing block 7 moves from the end of the annular groove 18 away from the screw 3 to the end of the annular groove 18 close to the screw 3 only due to the forward movement of the connecting rod 11, and the relative position of the slot 6 remains unchanged. As the connecting rod 11 continues to be pushed forward, the first matching inclined surface 1701 on the driving block 15 will be in contact with the second matching inclined surface 1701 in the through groove 13. 1702 cooperates with each other, thereby gradually penetrating into the through groove 13 and gradually inserting the piston block 10 through the fourth matching inclined surface 1704 set in the matching groove 12 and partially passing through the matching groove 12 and inserting into the giving way groove 14. As the driving block 15 penetrates into the inner wall of the matching groove 12, the piston block 10 will move toward the direction close to the screw rod 3. At this time, the air cavity 9 will be in a negative pressure state. Since one end of the air cavity 9 is connected with the slot 6 and the sealing block 7 is located at the opening of the slot 6 and seals the opening of the slot 6, when the air cavity 9 is in a negative pressure state When the sealing block 7 is inserted into the slot 6 due to the air pressure, the nozzle 2 will be opened. Since the driving block 15 on the connecting rod 11 is partially inserted into the clearance groove 14, the connecting rod 11 cannot move forward. At this time, the screw 3 is driven to push forward, and one end of the connecting rod 11 will gradually move in the direction of the avoidance hole 24, and the screw 3 can continue to push forward in the direction of the nozzle 2, so that the screw 3 can further squeeze out the material in the barrel 1, reduce the material that will remain in the nozzle 2 after the material is squeezed out, and thus reduce the waste of material;When the material is extruded, the screw 3 retreats, and the end of the second elastic hook 2102 set at one end of the screw 3 gradually approaches the second clamping groove 2302 and engages with its end. When the second elastic hook 2102 is engaged with the second clamping groove 2302, the screw 3 will pull the connecting rod 11 back. When the connecting rod 11 retreats, the driving block 15 set on the connecting rod 11 will gradually come out of the yielding groove 14, the matching groove 12 and the through groove 13. When the driving block 15 is disengaged from the matching groove 12, the piston block 10 loses the squeezing of the driving block 15 on it, and the driving block 15 moves away from the screw. 3, at this time, the air cavity 9 returns to normal pressure, and the sealing block 7 inserted into the slot 6 will be released from the slot 6 due to the first spring 801 set between the two sealing blocks 7, and will be inserted into the annular groove 18, thereby closing the nozzle 2, reducing the probability of material flowing out of the nozzle 2 and reducing material waste. After that, the screw 3 is controlled to retreat, and the two sealing blocks 7 will slide in the nozzle 2 in a sealed manner. At this time, the sealing block 7 can scrape the material remaining in the nozzle 2 from the inner wall of the nozzle 2, and push the scraped material back into the barrel 1 as the screw 3 retreats, thereby further reducing material waste. ;

[0045] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An injection molding machine barrel, comprising a barrel (1), a nozzle (2) located at the injection end of the barrel (1), and a screw (3) located in the barrel (1) and moving closer to or farther from the nozzle (2), characterized in that: An opening and closing component for opening and closing the nozzle (2) is arranged in the barrel (1), and a linkage component is arranged between the opening and closing component and the screw (3) for driving the opening and closing component to open or close as the screw (3) moves forward or backward; The opening and closing component comprises a slot (6) symmetrically arranged on the inner wall of the nozzle (2), and two sealing blocks (7) that can be relatively engaged or relatively opened, wherein when the sealing blocks (7) are relatively engaged, the opposite ends of the two seals are separated and seal the opening of the slot (6), and when the sealing blocks (7) are relatively opened, the opposite ends of the two seals are sealed and plugged into the slot (6), and a guide component for guiding the engagement direction of the two seals is arranged at the opposite ends of the sealing blocks (7) and a first spring (801) that keeps the two seals in an engaged state in a normal state; A linkage assembly comprises an air cavity (9) arranged on the inner wall of the nozzle (2) and connected to the bottom of the slot (6), a piston block (10) which moves in a sealed manner in the air cavity (9), and a second spring (802) arranged at the bottom of the air cavity (9) to drive the piston block (10) to be in an extended state, and a matching component is arranged between the piston block (10) and the screw rod (3) to retract the piston block (10) as the screw rod (3) is pushed forward and to extend and reset the piston block (10) as the screw rod (3) retreats; The matching component comprises a connecting rod (11) protruding from the front end of the screw rod (3) and extending along the axial direction of the screw rod (3), a driving block (15) vertically elastically telescopically arranged on the outer ring wall of the connecting rod (11), and a matching groove (12) arranged on the piston block (10); a through groove (13) for the driving block (15) to pass through and a clearance groove (14) for partial insertion are respectively arranged on the inner ring wall of the nozzle (2) on the side close to or away from the connecting rod (11); a through groove (13) for the driving block (15) to pass through and a clearance groove (14) for partial insertion are respectively arranged on the side close to the through groove (13) of the driving block (15) to move away from the nozzle A first matching bevel (1701) extends from the direction of the nozzle (2) toward the center of the barrel (1), and a second matching bevel (1702), a third matching bevel (1703) and a fourth matching bevel (1704) are respectively arranged on the inner walls of the through groove (13), the matching groove (12) and the clearance groove (14) near one end of the screw rod (3), and can be matched with the first matching bevel (1701). When the sealing block (7) retracts to the maximum stroke, one end of the first matching bevel (1701) is inserted into the clearance groove (14) and the other end is located inside the through groove (13); As the piston block (10) retracts, the sealing blocks (7) move away from each other and the nozzle (2) opens; as the piston block (10) extends and resets, the sealing blocks (7) move closer to each other and the nozzle (2) closes.

2. The barrel of an injection molding machine according to claim 1, characterized in that: An axial positioning structure is provided between the connecting rod (11) and the sealing block (7), which enables the connecting rod (11) and the sealing block (7) to form an axial positioning structure for a piston rod that can move in a sealed manner on the inner wall of the nozzle (2) when the screw rod (3) retracts.

3. An injection molding machine barrel according to claim 2, characterized in that: The axial positioning structure comprises an annular groove (18) arranged at a position of the connecting rod (11) away from the screw rod (3) and an arc groove (19) arranged on one side adjacent to the two sealing blocks (7) and partially inserted into the annular groove (18) when the two sealing blocks (7) are embraced, wherein the width of the annular groove (18) is greater than the thickness of the sealing block (7).

4. The barrel of an injection molding machine according to claim 1, characterized in that: The guide assembly comprises at least one guide sleeve (20) of decreasing size and mutually sleeved and arranged in a receiving groove (26); one end of the guide sleeve (20) with the smallest size is fixed to a sealing block (7) without a receiving groove (26); the first spring (801) is arranged in the innermost guide sleeve (20); and a first anti-slip component for reducing the probability of the guide sleeve (20) slipping out of the receiving groove (26) or other guide sleeves (20) is arranged between the guide sleeve (20) and the inner wall of the receiving groove (26) and between the guide sleeves (20) and the guide sleeves (20).

5. The barrel of an injection molding machine according to claim 4, characterized in that: The first anti-slip component comprises a first elastic hook (2101) arranged on the outer wall of the guide sleeve (20) near the bottom, an escape groove (22) is arranged on the outer wall of the guide sleeve (20) for escaping when the first elastic hook (2101) is deformed, and a first engaging groove (2301) is arranged on the inner wall of the accommodating groove (26) and the inner wall of the guide sleeve (20), the end of which can be engaged with the first elastic hook (2101) and for the first elastic hook (2101) to move therein.

6. The barrel of an injection molding machine according to claim 1, characterized in that: An avoidance hole (24) is provided at one end of the screw (3) close to the connecting rod (11) for partially inserting the connecting rod (11) when the driving block (15) is inserted into the clearance groove (14) so ​​that the screw (3) can continue to move forward to further extrude the material in the barrel (1). There is a certain damping when sliding between the avoidance hole (24) and the connecting rod (11). A second anti-slip component for reducing the probability of the connecting rod (11) slipping out of the avoidance hole (24) is provided between the end of the connecting rod (11) close to the avoidance hole (24) and the avoidance hole (24).

7. An injection molding machine barrel according to claim 6, characterized in that: The second anti-slip component comprises a second elastic hook (2102) arranged at one end of the connecting rod (11) close to the screw rod (3), an avoidance ring groove (25) arranged at one end of the connecting rod (11) close to the second elastic hook (2102) for the second elastic hook (2102) to avoid deformation, and a second engaging groove (2302) arranged in the avoidance hole (24) and having an end portion that can be engaged with the second elastic hook (2102) and for the second elastic hook (2102) to slide therein.

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